摘要:
地下井间电磁波法层析技术(CT)是一门新技术,它将医学CT的原理成功地运用于地学中,依照电磁波在地下有耗介质中传播规律及一定的物理和数学关系,反演透视剖面上的物理参数的分布,最后以图像的形式表现出来。长江大堤武汉段附近的碳酸盐岩地区,由于地势较低和长江水位动态变化,使地下水长期作用于灰岩裂隙,往往使岩溶或破碎带更加发育,形成地下溶洞,给长江大堤和附近的工农业生产、居民生活带来极大的隐患和危险。通过井间电磁波法层析技术共90个电磁波CT剖面测试,发现有28个CT剖面出现异常。此次的探测,为长江大堤周边安全的防治提供可靠精确的地下地质资料。
Abstract:
Computerized tomography(CT)of cross-borehole electromagnetic is an advanced technology which successfully uses the principle of CT of medicine in geology.It reflects the physical parameter distribution in scenographic profile according the propagation of electromagnetic waves in lossy media and definite relation between physics and mathematics,finally gives the results by images.The Yangtze River Levees near the Wuhan section are in the area of carbonate rocks,as low-lying and the dynamic changes of Yangtze River water level which make underground water to erode limestone,generates more developed fissures,karst,fractures and so on,causing enormous hidden danger and risk to Yangtze River levee and affecting adjacent industry and agriculture production as well as the security of residents.Through electromagnetic wave CT in cross-borehole test at 90 observations,we have found that 28 observations are anomalous.This detection could provide accurate and reliable subsurface geological information for the safety assessment and early warning of the adjacent area around Yangtze River Levee.
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